221112100 has 36 divisors (see below), whose sum is σ = 523435248. Its totient is φ = 80404000.

The previous prime is 221112071. The next prime is 221112113. The reversal of 221112100 is 1211122.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 99406 + ... + 101605.

It is an arithmetic number, because the mean of its divisors is an integer number (14539868).

Almost surely, 2^221112100 is an apocalyptic number.

221112100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221112100 is an abundant number, since it is smaller than the sum of its proper divisors (302323148).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221112100 is a wasteful number, since it uses less digits than its factorization.

221112100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201036 (or 201029 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 221112100 is about 14869.8386003346. The cubic root of 221112100 is about 604.6965670998.

Adding to 221112100 its reverse (1211122), we get a palindrome (222323222).

The spelling of 221112100 in words is "two hundred twenty-one million, one hundred twelve thousand, one hundred".